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H BAURLIN ELECTRIC ARU LAMP.

No. 576,802. Patented Feb. 9,1897.

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ELECTRIC ARC LAMP. N0. 576,802. Patented Feb. 9, 1897.

' filial-nay UNITED STATES PATENT OEEIcE,

HERMANN BAURLIN, OF AARBURG, SWITZERLAND.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent N0. 5'? 6,802, datedFebruary 9, 1897.

Application filed May 11, 1896. Serial No. 691,120. (No model.)

To all whom, it may concern.-

Be it known that I, HERMANN BAURLIN, a citizen of Switzerland, and aresident of Aarburg, in the canton of Aargau, Switzerland, have inventedcertain new and useful Improvements in Regulators for Electric-ArcLamps, of which the following is a specification.

My invention relates to an improved mechanism for regulatingelectric-arc lamps, and especially to that kind of regulating mechanismwhere the regulating electromagnet is excited by a shunt-current. Thearrangement provided for this purpose is fully and clearly described inthe accompanying drawings, in whichv Figure 1 is a central verticalsection through a complete arc-lamp provided with the new regulatingdevice. Fig. 2 is a central vertical section at right angles to that ofFig. 1. Fig. 3 is a plan view of the lamp with the cap removed, andFigs. 4 to 13 are details of various parts of the lamp.

The cylindrical sheet-metal casing A carries at its lower end thereflector B, and is also fixed by screws to to a ring-shaped bottom 0,having a diametrical cross-piece C, said ring being connected by thestrips 0 with the plate D, upon which the regulating mechanism ismounted and which is covered by a cap E, fastened to the circumferenceof plate D by screws 6.

Upon the plate D is mounted a horseshoe electromagnet F, whose armatureG consists of two metal plates g g, connected by staybolts g g g and across-piece 9 said armature being pivoted between two centeringscrews dd, supported by the pins d (1. Each of the plates g has at its extremityopposite to the cores of the magneta soft-iron piece f, serving as thearmature proper, to be acted upon by the electromagnet. The pieces ffare connected by a cross-bar f, carrying in its middle part a rod fjointed to the piston 7L, which fits into a cylinder 7t, thisarrangement serving as an air-cushion brake or damper. To the otherextremity of plates 9 g is attached a spiral spring L by means of thepin 9. Said spring, being fastened also to the fixed plate D, tends tokeep the other extremity of the plates g g and the armaturepiecesffat adistance from the-electromagnet.

Between the side plates g g, forming a rocking lever, is placed aclockwork operated by the weight M, suspended on a cord m. This cordpasses over the larger pulley m and a smaller one m and connects to theend of the rod N, guided by a tube N which is fastened to but insulatedfrom the cross-piece O of the ring 0 by means of abushing 0 This rod Nserves as holder for the lower carbon of the arc-lamp, for which purposeit is provided with a clamp N, fixed to the lower end of rod N. The topof this rod is guided by a cross-head N insulated from the rod N by abushing N and passing by means of the slots n n between the guiding-barsn M, connecting the base-ring O and the plate D. In the same manner areprovided parallel to the vertical axis of the weight M, to the right andleft, the guiding-bars M M, passing through suitable holes or slots ofthe pins M M in the weight M, which latter carries a clamp M secured inan insulating-bushing M therein to hold the upper carbon and insulate itfrom the mechanism for regulating the feed adjustment of the carbons.

To the clamp M" and to the top of the bar N are attached the insulatedconducting-Wires 0 0 in a suitable manner and are also affixed to theterminals o 0 from which also the shunt-circuit branches 01?, passingaround the coils of the electromagnet, as will be hereinafter described.This circuit is indicated by the wires 1) 19, Fig. 3. The terminals 0 0serve also for connection with an external circuit, from which the lampis to derive its current. For engagement of the clockwork there isprovided on the axis of rope-pulley m a pinion Q, geared to a train ofgear-wheels, the last one having an escapement-wheel L, which gears intothe escapement-wheel Q fixed on the axis R, the latter being providedwith a double horizontal pendulum R, the said axis R also having afriction-disk R to which the brake is applied.

To the angular cross-piece g is fixed another cross-plate g upon thehorizontal part of which is screwed an auxiliary armature S, composed ofthe strip 8 and the soft-iron cross-piece S. This auxiliary armature isnot rigidly fixed to the plate g but an inclination of the end uponwhich S is fixed, caused by attraction of the magnet F for the soft-ironpiece b", is made possible by the elasticity of the cross-piece 9 whichelasticity tends to keep the auxiliary armature at a dis tance from theelectromagnet. The other extremity of the auxiliary armature is providedwith a set-screw T, whose point is pressed down upon the friction-disk RThe set-screw point T, iixed in a support U, attached to the one sideplate 9, serves to limit the upward motion of the armature The apparatusworks as follows: The carbons being normally separated, as described,the current is sent into the two wires 0 o. The potential dil'ierencebetween the two carbons being su iiicientlygreat. the magnetic coilswill be strongly excited by the shunt-circuit, so that the armature, bymeans of its pole-pieces or its ends ff, is attracted an d turned aroundits fulcrum-points (Z (I, by which means the carbonmints are broughttogether; butas the softiron pieces ff now form part of the magneticcores they will also attract the auxiliary armature S, whose oppositeextremity will thereby be lifted, the set-screw T raised, and the:iriction-disk it released. lhe weight M will therefore be allowed tosink down like an ordinary clock-weight and its descending movementexactly regulated by the escapement and the pendulum R, above described.At the same time the lower carbon is raised by the eloclnvork, and theupward pull of cord m and their two ends will approach n11- til theywill come in contact with one another. The potential dillerence betweenthe carbons will new fall oil and the shunt-current in the magneticcoils of I will also be diminished, in consequence of which the spring Lwill draw back the armature and turn it around the fulcrum (Z (l, andthe auxiliary armature S will also again press with its extremityagainst the friction-d isk R and hold the clockwork and carbons steady.

\Vhen the armature G is turned by the spring L and the top carbon israised, the are will appear between the carbons. Consequently theshunt-current is increased again and the main armature is attracted bythe magnet; but at first the shunt-current will not be strong enough toattract the auxiliary armature. Moreover, the attraction of the mainarmature will not be a sudden one, but

the approach of the armature to the cores will take place gradually andproportionally to the length of the are and the increase of potentialdifference and ot' sluint-cnrrent hereby caused. 11, finally, thelat-tor becomes intense enough, the auxiliary armatu re is alsoattracted, the clockwork is released, and the distance between thecarbons hereby regulated until the potential difference, and there forealso the shunt-current, is diminished.

The clockwork is wound up by drawing down the carbon-holder N, wherebythe weight M is lifted, which is done "whenever carbrms are put into theholders.

It is obvious that many slight alteraiitms may be made in the parts andcombinations of parts hereinbelore described, and hence .i would have itunderstood that I do not strictly confine myself to the specificconstruction shown.

I claim as my intention and desire to so cure by Letters Patent- 1. Inan electric-are lamp the combination of an clectromagnet included in ashunt-circuit of a main armature having side plates and a clockworksupported thereon carrying a ribbon from which the carbon is supported,a horizontal pendulum, a .Lriction-disk upon the axis thereof, and anauxiliary armature elasticallysupported upon the main armaturecontrolled by said electromagnct and having an adjustable break-screw topress upon said friction-disk, substantially as described.

2. In an electric-arc lamp, the combination with the lamp-framecomgrising a reflector ring-shaped bottom C, an. upper plate I), ashunt-magnet armature and gear supported upon said plate, agem-operating weight M, insulated from carrying the upper carbon andguided by wires M, a rod N, supporting the lOWGF-Cttl'lDOh holder andinsulated from the frame and guide-wires )l and '12? extending betweenthe bottom 0 and plate 1), substan tially as described.

In testimony that I claim the foregoing as my invention I have signed myname in pres ence of two subscribing witnesses.

IIERMANN llrtllftlplh'.

Witnesses:

ROBERT ANes'r, A. OnwIx MEYER.

